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First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH_2OH) and a New Compact Bipolar Outflow in HDO and CS

McGuire, Brett A. and Brogan, Crystal L. and Hunter, Todd R. and Remijan, Anthony J. and Blake, Geoffrey A. and Burkhardt, Andrew M. and Carroll, P. Brandon and van Dishoeck, Ewine F. and Garrod, Robin T. and Linnartz, Harold and Shingledecker, Christopher N. and Willis, Eric R. (2018) First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH_2OH) and a New Compact Bipolar Outflow in HDO and CS. Astrophysical Journal Letters, 863 (2). Art. No. L35. ISSN 2041-8213. doi:10.3847/2041-8213/aad7bb.

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We present the first results of a pilot program to conduct an Atacama Large Millimeter Array (ALMA) band 10 spectral line survey of the high-mass star-forming region NGC 6334I. The observations were taken in exceptional weather conditions (0.19 mm precipitable water) with typical system temperatures T_(sys) < 950 K at ~890 GHz. A bright, bipolar north–south outflow is seen in HDO and CS emission, driven by the embedded massive protostar MM1B. This has allowed, for the first time, a direct comparison of the thermal water in this outflow to the location of water maser emission from prior 22 GHz Very Large Array observations. The maser locations are shown to correspond to the sites along the outflow cavity walls, where high-velocity gas impacts the surrounding material. We also compare our new observations to prior Herschel Heterodyne Instrument for the Far-infrared (HIFI) spectral line survey data of this field, detecting an order of magnitude more spectral lines (695 versus 65) in the Atacama Large Millimeter/submillimeter Array (ALMA) data. We focus on the strong detections of the complex organic molecule glycolaldehyde (HC(O)CH2OH) in the ALMA data that is not detected in the heavily beam-diluted HIFI spectra. Finally, we stress the need for dedicated THz laboratory spectroscopy to support and exploit future high-frequency molecular line observations with ALMA.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
McGuire, Brett A.0000-0003-1254-4817
Brogan, Crystal L.0000-0002-6558-7653
Hunter, Todd R.0000-0001-6492-0090
Remijan, Anthony J.0000-0001-9479-9287
Blake, Geoffrey A.0000-0003-0787-1610
Burkhardt, Andrew M.0000-0003-0799-0927
Carroll, P. Brandon0000-0002-3191-5401
van Dishoeck, Ewine F.0000-0001-7591-1907
Garrod, Robin T.0000-0001-7723-8955
Linnartz, Harold0000-0002-8322-3538
Shingledecker, Christopher N.0000-0002-5171-7568
Willis, Eric R.0000-0002-7475-3908
Alternate Title:First Results of an ALMA Band 10 Spectral Line Survey of NGC 6334I: Detections of Glycolaldehyde (HC(O)CH2OH) and a New Compact Bipolar Outflow in HDO and CS
Additional Information:© 2018 The American Astronomical Society. Received 2018 July 2; revised 2018 August 1; accepted 2018 August 2; published 2018 August 17. The authors thank the anonymous referee for a careful evaluation that improved the quality of this manuscript. This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2017.1.00717.S, #2017.1.00661.S, and #2015.A.00022.T. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Support for B.A.M. was provided by NASA through Hubble Fellowship grant #HST-HF2-51396 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. Support for A.M.B. was provided by the NSF through the Grote Reber Fellowship Program administered by Associated Universities, Inc./National Radio Astronomy Observatory and the Virginia Space Grant Consortium. This research made use of NASAs Astrophysics Data System Bibliographic Services, Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013), and APLpy, an open-source plotting package for Python hosted at
Group:Astronomy Department
Funding AgencyGrant Number
NASA Hubble FellowshipHST-HF2-51396
Subject Keywords:astrochemistry – ISM: individual objects (NGC 6334I) – ISM: jets and outflows – ISM: molecules – masers
Issue or Number:2
Record Number:CaltechAUTHORS:20180817-104052350
Persistent URL:
Official Citation:Brett A. McGuire et al 2018 ApJL 863 L35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88897
Deposited By: Tony Diaz
Deposited On:17 Aug 2018 17:53
Last Modified:16 Nov 2021 00:30

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